Number + 美元
美元 (měiyuán) means U.S. dollar and functions as both a noun and a measure word for counting amounts in American currency. It is placed directly after a number to indicate a price or monetary amount in dollars.
这件衣服花了我一百美元。
Zhè jiàn yīfu huā le wǒ yī bǎi měiyuán.
This piece of clothing cost me one hundred dollars.
现在一美元大概可以换七块多人民币。
Xiànzài yī měiyuán dàgài kěyǐ huàn qī kuài duō rénmínbì.
Right now one US dollar can be exchanged for a little over seven RMB.
他每个月要还三百美元的学生贷款。
Tā měi ge yuè yào huán sān bǎi měiyuán de xuéshēng dàikuǎn.
He has to pay back three hundred dollars in student loans every month.